Steam-blower for stacks of boiler - furnaces



' UNITED STATES PATENT OEEICE.

TOWNSEND POORE, OF SGRANTON, PENNSYLVANIA.

STEAM-BLOWER FOR STACKS OF BOILER-FURNACES.

SPECIFICATION forming part of Letters Patent No. 333,543, dated January 5, 1,886

Applica-tion filed May 9, 1885. Serial No. 164,873. (No model.)

To all whom it may concern:

Beit known that I, TowNsEND PooRE, a citizen of the United States, residing at Scranton, in the county of Lackawanna and State of Pennsylvania, have invented a new and useful Improvement in Steam-Blowers for Stacks of Boiler-Furnaces, of which the following is a specification. y

In the accompanying drawings, Figure 1 is a vertical section of a portion of a boiler-furnace, the boiler and steam-blower being in elevation. Fig. 2 is a plan view of Fig. 1, steam-supply pipe being omitted. Fig. 3 is a detail perspective view illustrating the improved steam-blower in a stack. Fig. 4 is a detail vertical section of the stack and adjusting portion of the steam-pipe, and an elevation of the guide and supply-pipe; and Fig. 5 is a detail view of steam blast pipe and its guide, showing an elbowjoint substituted for the adjusting portion of the steam-pipe.

My invention relates to steam-blowers for creating adraft by blast of steam under boilerpressure through a nozzle or jet in the stack of a boiler-furnace; and it consists, first, in a centering contrivance applied to the steamblast pipe, and bearing with a radial frictional pressure against the inner surface of the stack in such manner as to keep the pipe steady and truly centered in a stack, and ad` mit of its being adjusted either up or down in the stack to any extent necessary, in order to secure the proper focus for blast nozzle or jet; second, in a removable adjusting stuffing-box section of steam-pipe, in combination with the supply and blast pipe sec` tions, and with the centering contrivance, whereby the proper adjustment may be secured for a series of blast-nozzles in a series or" stacks, and when such adjustments are effected the Vstuffing-boar section may be removed and an elbow-section made to take its place on each blast-pipe.

In the drawings, A A represent plain cylinder boilers, formed of boiler-plate riveted together and provided with castiron heads. They are usually from thirty to fifty feet long, and the fire from the furnace B is applied at one end of these boilers, traverses their whole length, and passes into a stack, C. The stacks are either round or square in shape, and when round are preferably made of metal, and when of square form are preferably constructed of brick. The height of these stacks ranges from fifty to eighty feet. The boilers A are usually applied in nests containing from two to siX boilers, and are built within brick walls of the furnace, as illustrated.

In the drawings a nest of three boilers, arranged as above described and provided with a round metal stack, is shown.

F are lugs by which the boilers are partly suspended.

J J are plates for covering the flue and carrying the stack. t

L is a girder, and L lugs partly carrying the boilers.

It is very desirable to have a means whereby blowers may be placed at the proper altitude in these high stacks from aposition at or near their base; and the invention which I shall now specially describe enables this to be done in a very satisfactory manner, as will be seen. Iiirst prepare a suitable number of sections of half-inch or threequarters inch, or other suitable-sized gas-pipe, a, with screw-threadsv to receive bolting-iianges b, and I apply a steam-blast nozzle or jet, c, upon one section, and at a proper distance below this nozzle or jet I arrange an armed centering contrivance, d, fastening the same by its hub c to the pipe. This contrivance may have a series of arms, f, and they should be formed with curved spring-acting or other equivalent yielding termini, as shown, or be made in any other suitable manner, so as to bear rmly against the inner surface of the stack and still be free to slide up and down when the gas-pipe is forced up or pulled downward in the stack. Three arms would answer well in a round stack, and four better for fitting in the corners of a square one.' The first section of the pipe is pushed up into the stack, and kept centered by the yielding arms. Then the additional sections arev applied, every additional section being screwed or coupled to the section above it. When the steam-blast nozzle or jet arrives at about the proper height in the stack, which will have been previously determined upon by tests, an adjusting device, D, in the form of an elbow-section of pipe of larger diameter than pipe a, with a stuffing-box, D', at its upper end, is adjusted around the lower end of the last section of gas-pipe and connected with the steam-supply pipe E of the boiler.

The lower end of the bottom section of the steam-blast pipe extends down into the chamber of the stuffing-box section some distance, in order that an upward adjustment of the whole blast-pipe may be effected without drawing said end out of the stuffing-box section. The stufIing-box D makes a steamtight joint at all times. In the stack a manhole, F, closed by a door, is provided, and through this hole workmen can enter the stack, and also an anemometer can be placed for the purpose of having it indicate or measure the power of the blast of air drawn in by the steamblast of the nozzle or jet. When the anemometer is in position, the steam from the boiler is let on through a suitable cock, G, and accordingly asthe anemometer indicates the blast too slight or too great the end of the gaspipe which is down in the stuffing-box section of pipe is adjusted either down or up until the most perfect or very nicest adjust-ment of the nozzle or jet in the stack has been effected. This accomplished, steam is shut off, the stuft'- ing-boX section removed, and an elbow-section, h, substituted therefor, as illustrated in Fig. 5. In this manner a series of stacks may be provided with accurately-adjusted,steam nozzles or jets, and only one stuffing-box section be employed in the operation. If a short section of pipe requires to be placed between two gaspipe sections, this can be readily done, as such section can be provided with bolting-langes and introduced between the flanges of two other sections. Near the lower end of the gas-pipe a temporary stay and guide, I, is provided, and in this guide a set or clamping screw, z', is secured for the purpose of fastening the pipe and retaining it in any of its adjusted positions until the stung-box section is removed, and the elbow-section h (shown in Fig. 5) is applied.

The steam-blast nozzle or jet may be of any desired construction, and instead of a single jet a number of separate jets may be provided on the end of the pipe, or, if deemed advisable, several jets, each having its own steampipe, may be provided in the same stack; but this may be too expensive and unnecessary, as the supply-pipe and gas-pipe may be increased in size as circumstances demand.

In practice I shall take out the temporary guide and the stuffing-box section, and conby an anemometer in the same manner as withA live steam.

The utility of my invention will be apparent when it is considered that there is only one correct position for a jet or steam nozzle when operating in a stack, and that it is almost impossible to put a blower into-a stack already built, or to repair or clean it should it become stopped, except in the manner herein described and shown, and then only properly by the aid of an anemometer in the manner set forth.

In some constructions and uses of myinvention it may be practicable to makethe arms of the centering contrivance inelastic or unyielding, and I desire my patent to cover a centering device in the relations described and shown, whether the arms of said device are yielding or unyielding; but while this is the case I believe the yielding construction possesses the greater utility.

IVhat I claim as my invention isl. A steam-blowerin a stack provided with a centering contrivance applied to its sectional steam-blast pipe and binding against the stack, and adjustable up and down with the pipe in the stack by pushing the pipe up or pulling it downward, substantially as described.

2. The combination, with the stack, of the steam -blower built up of sections of pipe whichformacontinuouslaterally-closed steamblast pipe,and provided with a centering contrivance and connected with the supply-pipe of the steam-generator, substantially as described.

3. The combination of the removable stuffing-box section and temporary guide and support, the steam-supply pipe of the boiler, the blast-pipe and its steam-blast nozzle or jet, a centering contrivance,aud a stack having a, man-hole covered with a door for the admission of an anemometer and for other uses, substantially as and for the purpose described.

TOWNSEN D POORE.

Witnesses: j

JOHN R. HARRIS, WM. EvANs.

IIO 

